*
* ARM Semihosting is documented in:
* Semihosting for AArch32 and AArch64 Release 2.0
- * https://static.docs.arm.com/100863/0200/semihosting.pdf
+ * https://github.com/ARM-software/abi-aa/blob/main/semihosting/semihosting.rst
*
* RISC-V Semihosting is documented in:
* RISC-V Semihosting
*/
#include "qemu/osdep.h"
-
+#include "qemu/timer.h"
+#include "exec/gdbstub.h"
+#include "gdbstub/syscalls.h"
#include "semihosting/semihost.h"
#include "semihosting/console.h"
#include "semihosting/common-semi.h"
-#include "qemu/timer.h"
-#include "exec/gdbstub.h"
+#include "semihosting/guestfd.h"
+#include "semihosting/syscalls.h"
+
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
#define COMMON_SEMI_HEAP_SIZE (128 * 1024 * 1024)
#else
#include "qemu/cutils.h"
-#ifdef TARGET_ARM
-#include "hw/arm/boot.h"
-#endif
+#include "hw/loader.h"
#include "hw/boards.h"
#endif
#define O_BINARY 0
#endif
-#define GDB_O_RDONLY 0x000
-#define GDB_O_WRONLY 0x001
-#define GDB_O_RDWR 0x002
-#define GDB_O_APPEND 0x008
-#define GDB_O_CREAT 0x200
-#define GDB_O_TRUNC 0x400
-#define GDB_O_BINARY 0
-
static int gdb_open_modeflags[12] = {
GDB_O_RDONLY,
- GDB_O_RDONLY | GDB_O_BINARY,
+ GDB_O_RDONLY,
GDB_O_RDWR,
- GDB_O_RDWR | GDB_O_BINARY,
+ GDB_O_RDWR,
+ GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC,
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC,
- GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC,
- GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
+ GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC,
+ GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND,
GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND,
- GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY,
GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND,
- GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY
-};
-
-static int open_modeflags[12] = {
- O_RDONLY,
- O_RDONLY | O_BINARY,
- O_RDWR,
- O_RDWR | O_BINARY,
- O_WRONLY | O_CREAT | O_TRUNC,
- O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
- O_RDWR | O_CREAT | O_TRUNC,
- O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
- O_WRONLY | O_CREAT | O_APPEND,
- O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
- O_RDWR | O_CREAT | O_APPEND,
- O_RDWR | O_CREAT | O_APPEND | O_BINARY
+ GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND,
};
-typedef enum GuestFDType {
- GuestFDUnused = 0,
- GuestFDHost = 1,
- GuestFDGDB = 2,
- GuestFDFeatureFile = 3,
-} GuestFDType;
+#ifndef CONFIG_USER_ONLY
-/*
- * Guest file descriptors are integer indexes into an array of
- * these structures (we will dynamically resize as necessary).
+/**
+ * common_semi_find_bases: find information about ram and heap base
+ *
+ * This function attempts to provide meaningful numbers for RAM and
+ * HEAP base addresses. The rambase is simply the lowest addressable
+ * RAM position. For the heapbase we ask the loader to scan the
+ * address space and the largest available gap by querying the "ROM"
+ * regions.
+ *
+ * Returns: a structure with the numbers we need.
*/
-typedef struct GuestFD {
- GuestFDType type;
- union {
- int hostfd;
- target_ulong featurefile_offset;
- };
-} GuestFD;
-static GArray *guestfd_array;
+typedef struct LayoutInfo {
+ target_ulong rambase;
+ size_t ramsize;
+ hwaddr heapbase;
+ hwaddr heaplimit;
+} LayoutInfo;
-#ifndef CONFIG_USER_ONLY
-#include "exec/address-spaces.h"
-/*
- * Find the base of a RAM region containing the specified address
- */
-static inline hwaddr
-common_semi_find_region_base(hwaddr addr)
+static bool find_ram_cb(Int128 start, Int128 len, const MemoryRegion *mr,
+ hwaddr offset_in_region, void *opaque)
{
- MemoryRegion *subregion;
+ LayoutInfo *info = (LayoutInfo *) opaque;
+ uint64_t size = int128_get64(len);
- /*
- * Find the chunk of R/W memory containing the address. This is
- * used for the SYS_HEAPINFO semihosting call, which should
- * probably be using information from the loaded application.
- */
- QTAILQ_FOREACH(subregion, &get_system_memory()->subregions,
- subregions_link) {
- if (subregion->ram && !subregion->readonly) {
- Int128 top128 = int128_add(int128_make64(subregion->addr),
- subregion->size);
- Int128 addr128 = int128_make64(addr);
- if (subregion->addr <= addr && int128_lt(addr128, top128)) {
- return subregion->addr;
- }
- }
+ if (!mr->ram || mr->readonly) {
+ return false;
}
- return 0;
-}
-#endif
-#ifdef TARGET_ARM
-static inline target_ulong
-common_semi_arg(CPUState *cs, int argno)
-{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
- if (is_a64(env)) {
- return env->xregs[argno];
- } else {
- return env->regs[argno];
+ if (size > info->ramsize) {
+ info->rambase = int128_get64(start);
+ info->ramsize = size;
}
-}
-static inline void
-common_semi_set_ret(CPUState *cs, target_ulong ret)
-{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
- if (is_a64(env)) {
- env->xregs[0] = ret;
- } else {
- env->regs[0] = ret;
- }
+ /* search exhaustively for largest RAM */
+ return false;
}
-static inline bool
-common_semi_sys_exit_extended(CPUState *cs, int nr)
+static LayoutInfo common_semi_find_bases(CPUState *cs)
{
- return (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(cs->env_ptr));
-}
+ FlatView *fv;
+ LayoutInfo info = { 0, 0, 0, 0 };
-#ifndef CONFIG_USER_ONLY
-#include "hw/arm/boot.h"
-static inline target_ulong
-common_semi_rambase(CPUState *cs)
-{
- CPUArchState *env = cs->env_ptr;
- const struct arm_boot_info *info = env->boot_info;
- target_ulong sp;
+ RCU_READ_LOCK_GUARD();
- if (info) {
- return info->loader_start;
- }
+ fv = address_space_to_flatview(cs->as);
+ flatview_for_each_range(fv, find_ram_cb, &info);
- if (is_a64(env)) {
- sp = env->xregs[31];
- } else {
- sp = env->regs[13];
+ /*
+ * If we have found the RAM lets iterate through the ROM blobs to
+ * work out the best place for the remainder of RAM and split it
+ * equally between stack and heap.
+ */
+ if (info.rambase || info.ramsize > 0) {
+ RomGap gap = rom_find_largest_gap_between(info.rambase, info.ramsize);
+ info.heapbase = gap.base;
+ info.heaplimit = gap.base + gap.size;
}
- return common_semi_find_region_base(sp);
-}
-#endif
-#endif /* TARGET_ARM */
-
-#ifdef TARGET_RISCV
-static inline target_ulong
-common_semi_arg(CPUState *cs, int argno)
-{
- RISCVCPU *cpu = RISCV_CPU(cs);
- CPURISCVState *env = &cpu->env;
- return env->gpr[xA0 + argno];
-}
-
-static inline void
-common_semi_set_ret(CPUState *cs, target_ulong ret)
-{
- RISCVCPU *cpu = RISCV_CPU(cs);
- CPURISCVState *env = &cpu->env;
- env->gpr[xA0] = ret;
+ return info;
}
-static inline bool
-common_semi_sys_exit_extended(CPUState *cs, int nr)
-{
- return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8);
-}
-
-#ifndef CONFIG_USER_ONLY
-
-static inline target_ulong
-common_semi_rambase(CPUState *cs)
-{
- RISCVCPU *cpu = RISCV_CPU(cs);
- CPURISCVState *env = &cpu->env;
- return common_semi_find_region_base(env->gpr[xSP]);
-}
#endif
-#endif
+#include "common-semi-target.h"
/*
- * Allocate a new guest file descriptor and return it; if we
- * couldn't allocate a new fd then return -1.
- * This is a fairly simplistic implementation because we don't
- * expect that most semihosting guest programs will make very
- * heavy use of opening and closing fds.
- */
-static int alloc_guestfd(void)
-{
- guint i;
-
- if (!guestfd_array) {
- /* New entries zero-initialized, i.e. type GuestFDUnused */
- guestfd_array = g_array_new(FALSE, TRUE, sizeof(GuestFD));
- }
-
- /* SYS_OPEN should return nonzero handle on success. Start guestfd from 1 */
- for (i = 1; i < guestfd_array->len; i++) {
- GuestFD *gf = &g_array_index(guestfd_array, GuestFD, i);
-
- if (gf->type == GuestFDUnused) {
- return i;
- }
- }
-
- /* All elements already in use: expand the array */
- g_array_set_size(guestfd_array, i + 1);
- return i;
-}
-
-/*
- * Look up the guestfd in the data structure; return NULL
- * for out of bounds, but don't check whether the slot is unused.
- * This is used internally by the other guestfd functions.
- */
-static GuestFD *do_get_guestfd(int guestfd)
-{
- if (!guestfd_array) {
- return NULL;
- }
-
- if (guestfd <= 0 || guestfd >= guestfd_array->len) {
- return NULL;
- }
-
- return &g_array_index(guestfd_array, GuestFD, guestfd);
-}
-
-/*
- * Associate the specified guest fd (which must have been
- * allocated via alloc_fd() and not previously used) with
- * the specified host/gdb fd.
- */
-static void associate_guestfd(int guestfd, int hostfd)
-{
- GuestFD *gf = do_get_guestfd(guestfd);
-
- assert(gf);
- gf->type = use_gdb_syscalls() ? GuestFDGDB : GuestFDHost;
- gf->hostfd = hostfd;
-}
-
-/*
- * Deallocate the specified guest file descriptor. This doesn't
- * close the host fd, it merely undoes the work of alloc_fd().
+ * Read the input value from the argument block; fail the semihosting
+ * call if the memory read fails. Eventually we could use a generic
+ * CPUState helper function here.
+ * Note that GET_ARG() handles memory access errors by jumping to
+ * do_fault, so must be used as the first thing done in handling a
+ * semihosting call, to avoid accidentally leaking allocated resources.
+ * SET_ARG(), since it unavoidably happens late, instead returns an
+ * error indication (0 on success, non-0 for error) which the caller
+ * should check.
*/
-static void dealloc_guestfd(int guestfd)
-{
- GuestFD *gf = do_get_guestfd(guestfd);
- assert(gf);
- gf->type = GuestFDUnused;
-}
+#define GET_ARG(n) do { \
+ if (is_64bit_semihosting(env)) { \
+ if (get_user_u64(arg ## n, args + (n) * 8)) { \
+ goto do_fault; \
+ } \
+ } else { \
+ if (get_user_u32(arg ## n, args + (n) * 4)) { \
+ goto do_fault; \
+ } \
+ } \
+} while (0)
-/*
- * Given a guest file descriptor, get the associated struct.
- * If the fd is not valid, return NULL. This is the function
- * used by the various semihosting calls to validate a handle
- * from the guest.
- * Note: calling alloc_guestfd() or dealloc_guestfd() will
- * invalidate any GuestFD* obtained by calling this function.
- */
-static GuestFD *get_guestfd(int guestfd)
-{
- GuestFD *gf = do_get_guestfd(guestfd);
+#define SET_ARG(n, val) \
+ (is_64bit_semihosting(env) ? \
+ put_user_u64(val, args + (n) * 8) : \
+ put_user_u32(val, args + (n) * 4))
- if (!gf || gf->type == GuestFDUnused) {
- return NULL;
- }
- return gf;
-}
/*
* The semihosting API has no concept of its errno being thread-safe,
* as the API design predates SMP CPUs and was intended as a simple
* real-hardware set of debug functionality. For QEMU, we make the
- * errno be per-thread in linux-user mode; in softmmu it is a simple
+ * errno be per-thread in linux-user mode; in system-mode it is a simple
* global, and we assume that the guest takes care of avoiding any races.
*/
#ifndef CONFIG_USER_ONLY
static target_ulong syscall_err;
-#include "exec/softmmu-semi.h"
+#include "semihosting/uaccess.h"
#endif
-static inline uint32_t set_swi_errno(CPUState *cs, uint32_t code)
-{
- if (code == (uint32_t)-1) {
-#ifdef CONFIG_USER_ONLY
- TaskState *ts = cs->opaque;
-
- ts->swi_errno = errno;
-#else
- syscall_err = errno;
-#endif
- }
- return code;
-}
-
static inline uint32_t get_swi_errno(CPUState *cs)
{
#ifdef CONFIG_USER_ONLY
#endif
}
-static target_ulong common_semi_syscall_len;
-
-static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void common_semi_cb(CPUState *cs, uint64_t ret, int err)
{
- target_ulong reg0 = common_semi_arg(cs, 0);
-
- if (ret == (target_ulong)-1) {
- errno = err;
- set_swi_errno(cs, -1);
- reg0 = ret;
- } else {
- /* Fixup syscalls that use nonstardard return conventions. */
- switch (reg0) {
- case TARGET_SYS_WRITE:
- case TARGET_SYS_READ:
- reg0 = common_semi_syscall_len - ret;
- break;
- case TARGET_SYS_SEEK:
- reg0 = 0;
- break;
- default:
- reg0 = ret;
- break;
- }
- }
- common_semi_set_ret(cs, reg0);
-}
-
-static target_ulong common_semi_flen_buf(CPUState *cs)
-{
- target_ulong sp;
-#ifdef TARGET_ARM
- /* Return an address in target memory of 64 bytes where the remote
- * gdb should write its stat struct. (The format of this structure
- * is defined by GDB's remote protocol and is not target-specific.)
- * We put this on the guest's stack just below SP.
- */
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
-
- if (is_a64(env)) {
- sp = env->xregs[31];
- } else {
- sp = env->regs[13];
- }
-#endif
-#ifdef TARGET_RISCV
- RISCVCPU *cpu = RISCV_CPU(cs);
- CPURISCVState *env = &cpu->env;
-
- sp = env->gpr[xSP];
+ if (err) {
+#ifdef CONFIG_USER_ONLY
+ TaskState *ts = cs->opaque;
+ ts->swi_errno = err;
+#else
+ syscall_err = err;
#endif
-
- return sp - 64;
-}
-
-static void
-common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
-{
- /* The size is always stored in big-endian order, extract
- the value. We assume the size always fit in 32 bits. */
- uint32_t size;
- cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) + 32,
- (uint8_t *)&size, 4, 0);
- size = be32_to_cpu(size);
- common_semi_set_ret(cs, size);
- errno = err;
- set_swi_errno(cs, -1);
-}
-
-static int common_semi_open_guestfd;
-
-static void
-common_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
-{
- if (ret == (target_ulong)-1) {
- errno = err;
- set_swi_errno(cs, -1);
- dealloc_guestfd(common_semi_open_guestfd);
- } else {
- associate_guestfd(common_semi_open_guestfd, ret);
- ret = common_semi_open_guestfd;
}
common_semi_set_ret(cs, ret);
}
-static target_ulong
-common_semi_gdb_syscall(CPUState *cs, gdb_syscall_complete_cb cb,
- const char *fmt, ...)
+/*
+ * Use 0xdeadbeef as the return value when there isn't a defined
+ * return value for the call.
+ */
+static void common_semi_dead_cb(CPUState *cs, uint64_t ret, int err)
{
- va_list va;
-
- va_start(va, fmt);
- gdb_do_syscallv(cb, fmt, va);
- va_end(va);
-
- /*
- * FIXME: in softmmu mode, the gdbstub will schedule our callback
- * to occur, but will not actually call it to complete the syscall
- * until after this function has returned and we are back in the
- * CPU main loop. Therefore callers to this function must not
- * do anything with its return value, because it is not necessarily
- * the result of the syscall, but could just be the old value of X0.
- * The only thing safe to do with this is that the callers of
- * do_common_semihosting() will write it straight back into X0.
- * (In linux-user mode, the callback will have happened before
- * gdb_do_syscallv() returns.)
- *
- * We should tidy this up so neither this function nor
- * do_common_semihosting() return a value, so the mistake of
- * doing something with the return value is not possible to make.
- */
-
- return common_semi_arg(cs, 0);
+ common_semi_set_ret(cs, 0xdeadbeef);
}
/*
- * Types for functions implementing various semihosting calls
- * for specific types of guest file descriptor. These must all
- * do the work and return the required return value for the guest,
- * setting the guest errno if appropriate.
+ * SYS_READ and SYS_WRITE always return the number of bytes not read/written.
+ * There is no error condition, other than returning the original length.
*/
-typedef uint32_t sys_closefn(CPUState *cs, GuestFD *gf);
-typedef uint32_t sys_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len);
-typedef uint32_t sys_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len);
-typedef uint32_t sys_isattyfn(CPUState *cs, GuestFD *gf);
-typedef uint32_t sys_seekfn(CPUState *cs, GuestFD *gf,
- target_ulong offset);
-typedef uint32_t sys_flenfn(CPUState *cs, GuestFD *gf);
-
-static uint32_t host_closefn(CPUState *cs, GuestFD *gf)
+static void common_semi_rw_cb(CPUState *cs, uint64_t ret, int err)
{
- /*
- * Only close the underlying host fd if it's one we opened on behalf
- * of the guest in SYS_OPEN.
- */
- if (gf->hostfd == STDIN_FILENO ||
- gf->hostfd == STDOUT_FILENO ||
- gf->hostfd == STDERR_FILENO) {
- return 0;
+ /* Recover the original length from the third argument. */
+ CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
+ target_ulong args = common_semi_arg(cs, 1);
+ target_ulong arg2;
+ GET_ARG(2);
+
+ if (err) {
+ do_fault:
+ ret = 0; /* error: no bytes transmitted */
}
- return set_swi_errno(cs, close(gf->hostfd));
+ common_semi_set_ret(cs, arg2 - ret);
}
-static uint32_t host_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
+/*
+ * Convert from Posix ret+errno to Arm SYS_ISTTY return values.
+ * With gdbstub, err is only ever set for protocol errors to EIO.
+ */
+static void common_semi_istty_cb(CPUState *cs, uint64_t ret, int err)
{
- CPUArchState *env = cs->env_ptr;
- uint32_t ret;
- char *s = lock_user(VERIFY_READ, buf, len, 1);
- (void) env; /* Used in arm softmmu lock_user implicitly */
- if (!s) {
- /* Return bytes not written on error */
- return len;
- }
- ret = set_swi_errno(cs, write(gf->hostfd, s, len));
- unlock_user(s, buf, 0);
- if (ret == (uint32_t)-1) {
- ret = 0;
+ if (err) {
+ ret = (err == ENOTTY ? 0 : -1);
}
- /* Return bytes not written */
- return len - ret;
+ common_semi_cb(cs, ret, err);
}
-static uint32_t host_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
+/*
+ * SYS_SEEK returns 0 on success, not the resulting offset.
+ */
+static void common_semi_seek_cb(CPUState *cs, uint64_t ret, int err)
{
- CPUArchState *env = cs->env_ptr;
- uint32_t ret;
- char *s = lock_user(VERIFY_WRITE, buf, len, 0);
- (void) env; /* Used in arm softmmu lock_user implicitly */
- if (!s) {
- /* return bytes not read */
- return len;
- }
- do {
- ret = set_swi_errno(cs, read(gf->hostfd, s, len));
- } while (ret == -1 && errno == EINTR);
- unlock_user(s, buf, len);
- if (ret == (uint32_t)-1) {
+ if (!err) {
ret = 0;
}
- /* Return bytes not read */
- return len - ret;
-}
-
-static uint32_t host_isattyfn(CPUState *cs, GuestFD *gf)
-{
- return isatty(gf->hostfd);
+ common_semi_cb(cs, ret, err);
}
-static uint32_t host_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
+/*
+ * Return an address in target memory of 64 bytes where the remote
+ * gdb should write its stat struct. (The format of this structure
+ * is defined by GDB's remote protocol and is not target-specific.)
+ * We put this on the guest's stack just below SP.
+ */
+static target_ulong common_semi_flen_buf(CPUState *cs)
{
- uint32_t ret = set_swi_errno(cs, lseek(gf->hostfd, offset, SEEK_SET));
- if (ret == (uint32_t)-1) {
- return -1;
- }
- return 0;
+ target_ulong sp = common_semi_stack_bottom(cs);
+ return sp - 64;
}
-static uint32_t host_flenfn(CPUState *cs, GuestFD *gf)
-{
- struct stat buf;
- uint32_t ret = set_swi_errno(cs, fstat(gf->hostfd, &buf));
- if (ret == (uint32_t)-1) {
- return -1;
+static void
+common_semi_flen_fstat_cb(CPUState *cs, uint64_t ret, int err)
+{
+ if (!err) {
+ /* The size is always stored in big-endian order, extract the value. */
+ uint64_t size;
+ if (cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) +
+ offsetof(struct gdb_stat, gdb_st_size),
+ &size, 8, 0)) {
+ ret = -1, err = EFAULT;
+ } else {
+ size = be64_to_cpu(size);
+ if (ret != size) {
+ ret = -1, err = EOVERFLOW;
+ }
+ }
}
- return buf.st_size;
+ common_semi_cb(cs, ret, err);
}
-static uint32_t gdb_closefn(CPUState *cs, GuestFD *gf)
-{
- return common_semi_gdb_syscall(cs, common_semi_cb, "close,%x", gf->hostfd);
-}
-
-static uint32_t gdb_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- common_semi_syscall_len = len;
- return common_semi_gdb_syscall(cs, common_semi_cb, "write,%x,%x,%x",
- gf->hostfd, buf, len);
-}
-
-static uint32_t gdb_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- common_semi_syscall_len = len;
- return common_semi_gdb_syscall(cs, common_semi_cb, "read,%x,%x,%x",
- gf->hostfd, buf, len);
-}
-
-static uint32_t gdb_isattyfn(CPUState *cs, GuestFD *gf)
-{
- return common_semi_gdb_syscall(cs, common_semi_cb, "isatty,%x", gf->hostfd);
-}
-
-static uint32_t gdb_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
+static void
+common_semi_readc_cb(CPUState *cs, uint64_t ret, int err)
{
- return common_semi_gdb_syscall(cs, common_semi_cb, "lseek,%x,%x,0",
- gf->hostfd, offset);
-}
+ if (!err) {
+ CPUArchState *env G_GNUC_UNUSED = cpu_env(cs);
+ uint8_t ch;
-static uint32_t gdb_flenfn(CPUState *cs, GuestFD *gf)
-{
- return common_semi_gdb_syscall(cs, common_semi_flen_cb, "fstat,%x,%x",
- gf->hostfd, common_semi_flen_buf(cs));
+ if (get_user_u8(ch, common_semi_stack_bottom(cs) - 1)) {
+ ret = -1, err = EFAULT;
+ } else {
+ ret = ch;
+ }
+ }
+ common_semi_cb(cs, ret, err);
}
#define SHFB_MAGIC_0 0x53
SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */
};
-static void init_featurefile_guestfd(int guestfd)
-{
- GuestFD *gf = do_get_guestfd(guestfd);
-
- assert(gf);
- gf->type = GuestFDFeatureFile;
- gf->featurefile_offset = 0;
-}
-
-static uint32_t featurefile_closefn(CPUState *cs, GuestFD *gf)
-{
- /* Nothing to do */
- return 0;
-}
-
-static uint32_t featurefile_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- /* This fd can never be open for writing */
-
- errno = EBADF;
- return set_swi_errno(cs, -1);
-}
-
-static uint32_t featurefile_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- CPUArchState *env = cs->env_ptr;
- uint32_t i;
- char *s;
-
- (void) env; /* Used in arm softmmu lock_user implicitly */
- s = lock_user(VERIFY_WRITE, buf, len, 0);
- if (!s) {
- return len;
- }
-
- for (i = 0; i < len; i++) {
- if (gf->featurefile_offset >= sizeof(featurefile_data)) {
- break;
- }
- s[i] = featurefile_data[gf->featurefile_offset];
- gf->featurefile_offset++;
- }
-
- unlock_user(s, buf, len);
-
- /* Return number of bytes not read */
- return len - i;
-}
-
-static uint32_t featurefile_isattyfn(CPUState *cs, GuestFD *gf)
-{
- return 0;
-}
-
-static uint32_t featurefile_seekfn(CPUState *cs, GuestFD *gf,
- target_ulong offset)
-{
- gf->featurefile_offset = offset;
- return 0;
-}
-
-static uint32_t featurefile_flenfn(CPUState *cs, GuestFD *gf)
-{
- return sizeof(featurefile_data);
-}
-
-typedef struct GuestFDFunctions {
- sys_closefn *closefn;
- sys_writefn *writefn;
- sys_readfn *readfn;
- sys_isattyfn *isattyfn;
- sys_seekfn *seekfn;
- sys_flenfn *flenfn;
-} GuestFDFunctions;
-
-static const GuestFDFunctions guestfd_fns[] = {
- [GuestFDHost] = {
- .closefn = host_closefn,
- .writefn = host_writefn,
- .readfn = host_readfn,
- .isattyfn = host_isattyfn,
- .seekfn = host_seekfn,
- .flenfn = host_flenfn,
- },
- [GuestFDGDB] = {
- .closefn = gdb_closefn,
- .writefn = gdb_writefn,
- .readfn = gdb_readfn,
- .isattyfn = gdb_isattyfn,
- .seekfn = gdb_seekfn,
- .flenfn = gdb_flenfn,
- },
- [GuestFDFeatureFile] = {
- .closefn = featurefile_closefn,
- .writefn = featurefile_writefn,
- .readfn = featurefile_readfn,
- .isattyfn = featurefile_isattyfn,
- .seekfn = featurefile_seekfn,
- .flenfn = featurefile_flenfn,
- },
-};
-
-/*
- * Read the input value from the argument block; fail the semihosting
- * call if the memory read fails. Eventually we could use a generic
- * CPUState helper function here.
- */
-static inline bool is_64bit_semihosting(CPUArchState *env)
-{
-#if defined(TARGET_ARM)
- return is_a64(env);
-#elif defined(TARGET_RISCV)
- return !riscv_cpu_is_32bit(env);
-#else
-#error un-handled architecture
-#endif
-}
-
-
-#define GET_ARG(n) do { \
- if (is_64bit_semihosting(env)) { \
- if (get_user_u64(arg ## n, args + (n) * 8)) { \
- errno = EFAULT; \
- return set_swi_errno(cs, -1); \
- } \
- } else { \
- if (get_user_u32(arg ## n, args + (n) * 4)) { \
- errno = EFAULT; \
- return set_swi_errno(cs, -1); \
- } \
- } \
-} while (0)
-
-#define SET_ARG(n, val) \
- (is_64bit_semihosting(env) ? \
- put_user_u64(val, args + (n) * 8) : \
- put_user_u32(val, args + (n) * 4))
-
-
/*
* Do a semihosting call.
*
* The specification always says that the "return register" either
* returns a specific value or is corrupted, so we don't need to
* report to our caller whether we are returning a value or trying to
- * leave the register unchanged. We use 0xdeadbeef as the return value
- * when there isn't a defined return value for the call.
+ * leave the register unchanged.
*/
-target_ulong do_common_semihosting(CPUState *cs)
+void do_common_semihosting(CPUState *cs)
{
- CPUArchState *env = cs->env_ptr;
+ CPUArchState *env = cpu_env(cs);
target_ulong args;
target_ulong arg0, arg1, arg2, arg3;
target_ulong ul_ret;
char * s;
int nr;
- uint32_t ret;
- uint32_t len;
- GuestFD *gf;
int64_t elapsed;
- (void) env; /* Used implicitly by arm lock_user macro */
nr = common_semi_arg(cs, 0) & 0xffffffffU;
args = common_semi_arg(cs, 1);
switch (nr) {
case TARGET_SYS_OPEN:
{
- int guestfd;
+ int ret, err = 0;
+ int hostfd;
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
s = lock_user_string(arg0);
if (!s) {
- errno = EFAULT;
- return set_swi_errno(cs, -1);
+ goto do_fault;
}
if (arg1 >= 12) {
unlock_user(s, arg0, 0);
- errno = EINVAL;
- return set_swi_errno(cs, -1);
- }
-
- guestfd = alloc_guestfd();
- if (guestfd < 0) {
- unlock_user(s, arg0, 0);
- errno = EMFILE;
- return set_swi_errno(cs, -1);
+ common_semi_cb(cs, -1, EINVAL);
+ break;
}
if (strcmp(s, ":tt") == 0) {
- int result_fileno;
-
/*
* We implement SH_EXT_STDOUT_STDERR, so:
* open for read == stdin
* open for append == stderr
*/
if (arg1 < 4) {
- result_fileno = STDIN_FILENO;
+ hostfd = STDIN_FILENO;
} else if (arg1 < 8) {
- result_fileno = STDOUT_FILENO;
+ hostfd = STDOUT_FILENO;
} else {
- result_fileno = STDERR_FILENO;
+ hostfd = STDERR_FILENO;
}
- associate_guestfd(guestfd, result_fileno);
- unlock_user(s, arg0, 0);
- return guestfd;
- }
- if (strcmp(s, ":semihosting-features") == 0) {
- unlock_user(s, arg0, 0);
+ ret = alloc_guestfd();
+ associate_guestfd(ret, hostfd);
+ } else if (strcmp(s, ":semihosting-features") == 0) {
/* We must fail opens for modes other than 0 ('r') or 1 ('rb') */
if (arg1 != 0 && arg1 != 1) {
- dealloc_guestfd(guestfd);
- errno = EACCES;
- return set_swi_errno(cs, -1);
- }
- init_featurefile_guestfd(guestfd);
- return guestfd;
- }
-
- if (use_gdb_syscalls()) {
- common_semi_open_guestfd = guestfd;
- ret = common_semi_gdb_syscall(cs, common_semi_open_cb,
- "open,%s,%x,1a4", arg0, (int)arg2 + 1,
- gdb_open_modeflags[arg1]);
- } else {
- ret = set_swi_errno(cs, open(s, open_modeflags[arg1], 0644));
- if (ret == (uint32_t)-1) {
- dealloc_guestfd(guestfd);
+ ret = -1;
+ err = EACCES;
} else {
- associate_guestfd(guestfd, ret);
- ret = guestfd;
+ ret = alloc_guestfd();
+ staticfile_guestfd(ret, featurefile_data,
+ sizeof(featurefile_data));
}
+ } else {
+ unlock_user(s, arg0, 0);
+ semihost_sys_open(cs, common_semi_cb, arg0, arg2 + 1,
+ gdb_open_modeflags[arg1], 0644);
+ break;
}
unlock_user(s, arg0, 0);
- return ret;
+ common_semi_cb(cs, ret, err);
+ break;
}
+
case TARGET_SYS_CLOSE:
GET_ARG(0);
+ semihost_sys_close(cs, common_semi_cb, arg0);
+ break;
- gf = get_guestfd(arg0);
- if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
- }
-
- ret = guestfd_fns[gf->type].closefn(cs, gf);
- dealloc_guestfd(arg0);
- return ret;
case TARGET_SYS_WRITEC:
- qemu_semihosting_console_outc(cs->env_ptr, args);
- return 0xdeadbeef;
+ /*
+ * FIXME: the byte to be written is in a target_ulong slot,
+ * which means this is wrong for a big-endian guest.
+ */
+ semihost_sys_write_gf(cs, common_semi_dead_cb,
+ &console_out_gf, args, 1);
+ break;
+
case TARGET_SYS_WRITE0:
- return qemu_semihosting_console_outs(cs->env_ptr, args);
+ {
+ ssize_t len = target_strlen(args);
+ if (len < 0) {
+ common_semi_dead_cb(cs, -1, EFAULT);
+ } else {
+ semihost_sys_write_gf(cs, common_semi_dead_cb,
+ &console_out_gf, args, len);
+ }
+ }
+ break;
+
case TARGET_SYS_WRITE:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
- len = arg2;
-
- gf = get_guestfd(arg0);
- if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
- }
+ semihost_sys_write(cs, common_semi_rw_cb, arg0, arg1, arg2);
+ break;
- return guestfd_fns[gf->type].writefn(cs, gf, arg1, len);
case TARGET_SYS_READ:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
- len = arg2;
-
- gf = get_guestfd(arg0);
- if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
- }
+ semihost_sys_read(cs, common_semi_rw_cb, arg0, arg1, arg2);
+ break;
- return guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
case TARGET_SYS_READC:
- return qemu_semihosting_console_inc(cs->env_ptr);
+ semihost_sys_read_gf(cs, common_semi_readc_cb, &console_in_gf,
+ common_semi_stack_bottom(cs) - 1, 1);
+ break;
+
case TARGET_SYS_ISERROR:
GET_ARG(0);
- return (target_long) arg0 < 0 ? 1 : 0;
+ common_semi_set_ret(cs, (target_long)arg0 < 0);
+ break;
+
case TARGET_SYS_ISTTY:
GET_ARG(0);
+ semihost_sys_isatty(cs, common_semi_istty_cb, arg0);
+ break;
- gf = get_guestfd(arg0);
- if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
- }
-
- return guestfd_fns[gf->type].isattyfn(cs, gf);
case TARGET_SYS_SEEK:
GET_ARG(0);
GET_ARG(1);
+ semihost_sys_lseek(cs, common_semi_seek_cb, arg0, arg1, GDB_SEEK_SET);
+ break;
- gf = get_guestfd(arg0);
- if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
- }
-
- return guestfd_fns[gf->type].seekfn(cs, gf, arg1);
case TARGET_SYS_FLEN:
GET_ARG(0);
+ semihost_sys_flen(cs, common_semi_flen_fstat_cb, common_semi_cb,
+ arg0, common_semi_flen_buf(cs));
+ break;
- gf = get_guestfd(arg0);
- if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
- }
-
- return guestfd_fns[gf->type].flenfn(cs, gf);
case TARGET_SYS_TMPNAM:
+ {
+ int len;
+ char *p;
+
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
- if (asprintf(&s, "/tmp/qemu-%x%02x", getpid(),
- (int) (arg1 & 0xff)) < 0) {
- return -1;
+ len = asprintf(&s, "%s/qemu-%x%02x", g_get_tmp_dir(),
+ getpid(), (int)arg1 & 0xff);
+ if (len < 0) {
+ common_semi_set_ret(cs, -1);
+ break;
}
- ul_ret = (target_ulong) -1;
+ /* Allow for trailing NUL */
+ len++;
/* Make sure there's enough space in the buffer */
- if (strlen(s) < arg2) {
- char *output = lock_user(VERIFY_WRITE, arg0, arg2, 0);
- strcpy(output, s);
- unlock_user(output, arg0, arg2);
- ul_ret = 0;
+ if (len > arg2) {
+ free(s);
+ common_semi_set_ret(cs, -1);
+ break;
+ }
+ p = lock_user(VERIFY_WRITE, arg0, len, 0);
+ if (!p) {
+ free(s);
+ goto do_fault;
}
+ memcpy(p, s, len);
+ unlock_user(p, arg0, len);
free(s);
- return ul_ret;
+ common_semi_set_ret(cs, 0);
+ break;
+ }
+
case TARGET_SYS_REMOVE:
GET_ARG(0);
GET_ARG(1);
- if (use_gdb_syscalls()) {
- ret = common_semi_gdb_syscall(cs, common_semi_cb, "unlink,%s",
- arg0, (int)arg1 + 1);
- } else {
- s = lock_user_string(arg0);
- if (!s) {
- errno = EFAULT;
- return set_swi_errno(cs, -1);
- }
- ret = set_swi_errno(cs, remove(s));
- unlock_user(s, arg0, 0);
- }
- return ret;
+ semihost_sys_remove(cs, common_semi_cb, arg0, arg1 + 1);
+ break;
+
case TARGET_SYS_RENAME:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
GET_ARG(3);
- if (use_gdb_syscalls()) {
- return common_semi_gdb_syscall(cs, common_semi_cb, "rename,%s,%s",
- arg0, (int)arg1 + 1, arg2,
- (int)arg3 + 1);
- } else {
- char *s2;
- s = lock_user_string(arg0);
- s2 = lock_user_string(arg2);
- if (!s || !s2) {
- errno = EFAULT;
- ret = set_swi_errno(cs, -1);
- } else {
- ret = set_swi_errno(cs, rename(s, s2));
- }
- if (s2)
- unlock_user(s2, arg2, 0);
- if (s)
- unlock_user(s, arg0, 0);
- return ret;
- }
+ semihost_sys_rename(cs, common_semi_cb, arg0, arg1 + 1, arg2, arg3 + 1);
+ break;
+
case TARGET_SYS_CLOCK:
- return clock() / (CLOCKS_PER_SEC / 100);
+ common_semi_set_ret(cs, clock() / (CLOCKS_PER_SEC / 100));
+ break;
+
case TARGET_SYS_TIME:
- return set_swi_errno(cs, time(NULL));
+ ul_ret = time(NULL);
+ common_semi_cb(cs, ul_ret, ul_ret == -1 ? errno : 0);
+ break;
+
case TARGET_SYS_SYSTEM:
GET_ARG(0);
GET_ARG(1);
- if (use_gdb_syscalls()) {
- return common_semi_gdb_syscall(cs, common_semi_cb, "system,%s",
- arg0, (int)arg1 + 1);
- } else {
- s = lock_user_string(arg0);
- if (!s) {
- errno = EFAULT;
- return set_swi_errno(cs, -1);
- }
- ret = set_swi_errno(cs, system(s));
- unlock_user(s, arg0, 0);
- return ret;
- }
+ semihost_sys_system(cs, common_semi_cb, arg0, arg1 + 1);
+ break;
+
case TARGET_SYS_ERRNO:
- return get_swi_errno(cs);
+ common_semi_set_ret(cs, get_swi_errno(cs));
+ break;
+
case TARGET_SYS_GET_CMDLINE:
{
/* Build a command-line from the original argv.
#else
unsigned int i;
- output_size = ts->info->arg_end - ts->info->arg_start;
+ output_size = ts->info->env_strings - ts->info->arg_strings;
if (!output_size) {
/*
* We special-case the "empty command line" case (argc==0).
if (output_size > input_size) {
/* Not enough space to store command-line arguments. */
- errno = E2BIG;
- return set_swi_errno(cs, -1);
+ common_semi_cb(cs, -1, E2BIG);
+ break;
}
/* Adjust the command-line length. */
if (SET_ARG(1, output_size - 1)) {
/* Couldn't write back to argument block */
- errno = EFAULT;
- return set_swi_errno(cs, -1);
+ goto do_fault;
}
/* Lock the buffer on the ARM side. */
output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
if (!output_buffer) {
- errno = EFAULT;
- return set_swi_errno(cs, -1);
+ goto do_fault;
}
/* Copy the command-line arguments. */
goto out;
}
- if (copy_from_user(output_buffer, ts->info->arg_start,
+ if (copy_from_user(output_buffer, ts->info->arg_strings,
output_size)) {
- errno = EFAULT;
- status = set_swi_errno(cs, -1);
- goto out;
+ unlock_user(output_buffer, arg0, 0);
+ goto do_fault;
}
/* Separate arguments by white spaces. */
#endif
/* Unlock the buffer on the ARM side. */
unlock_user(output_buffer, arg0, output_size);
-
- return status;
+ common_semi_cb(cs, status, 0);
}
+ break;
+
case TARGET_SYS_HEAPINFO:
{
target_ulong retvals[4];
- target_ulong limit;
int i;
#ifdef CONFIG_USER_ONLY
TaskState *ts = cs->opaque;
+ target_ulong limit;
#else
- target_ulong rambase = common_semi_rambase(cs);
+ LayoutInfo info = common_semi_find_bases(cs);
#endif
GET_ARG(0);
retvals[2] = ts->stack_base;
retvals[3] = 0; /* Stack limit. */
#else
- limit = current_machine->ram_size;
- /* TODO: Make this use the limit of the loaded application. */
- retvals[0] = rambase + limit / 2;
- retvals[1] = rambase + limit;
- retvals[2] = rambase + limit; /* Stack base */
- retvals[3] = rambase; /* Stack limit. */
+ retvals[0] = info.heapbase; /* Heap Base */
+ retvals[1] = info.heaplimit; /* Heap Limit */
+ retvals[2] = info.heaplimit; /* Stack base */
+ retvals[3] = info.heapbase; /* Stack limit. */
#endif
for (i = 0; i < ARRAY_SIZE(retvals); i++) {
if (fail) {
/* Couldn't write back to argument block */
- errno = EFAULT;
- return set_swi_errno(cs, -1);
+ goto do_fault;
}
}
- return 0;
+ common_semi_set_ret(cs, 0);
}
+ break;
+
case TARGET_SYS_EXIT:
case TARGET_SYS_EXIT_EXTENDED:
+ {
+ uint32_t ret;
+
if (common_semi_sys_exit_extended(cs, nr)) {
/*
* The A64 version of SYS_EXIT takes a parameter block,
}
gdb_exit(ret);
exit(ret);
+ }
+
case TARGET_SYS_ELAPSED:
elapsed = get_clock() - clock_start;
if (sizeof(target_ulong) == 8) {
- SET_ARG(0, elapsed);
+ if (SET_ARG(0, elapsed)) {
+ goto do_fault;
+ }
} else {
- SET_ARG(0, (uint32_t) elapsed);
- SET_ARG(1, (uint32_t) (elapsed >> 32));
+ if (SET_ARG(0, (uint32_t) elapsed) ||
+ SET_ARG(1, (uint32_t) (elapsed >> 32))) {
+ goto do_fault;
+ }
}
- return 0;
+ common_semi_set_ret(cs, 0);
+ break;
+
case TARGET_SYS_TICKFREQ:
/* qemu always uses nsec */
- return 1000000000;
+ common_semi_set_ret(cs, 1000000000);
+ break;
+
case TARGET_SYS_SYNCCACHE:
/*
* Clean the D-cache and invalidate the I-cache for the specified
* virtual address range. This is a nop for us since we don't
* implement caches. This is only present on A64.
*/
-#ifdef TARGET_ARM
- if (is_a64(cs->env_ptr)) {
- return 0;
+ if (common_semi_has_synccache(env)) {
+ common_semi_set_ret(cs, 0);
+ break;
}
-#endif
-#ifdef TARGET_RISCV
- return 0;
-#endif
- /* fall through -- invalid for A32/T32 */
+ /* fall through */
default:
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
cpu_dump_state(cs, stderr, 0);
abort();
+
+ do_fault:
+ common_semi_cb(cs, -1, EFAULT);
+ break;
}
}
projects / mirror_qemu.git / blobdiff